ET spoke with Biel, 34, at the premiere, who opened up about her first feature film producorial effort and admitted that producing is "so much harder" than acting.

"[There are] so many more things to take care of, so many more hats to wear. Problems you have to fix," Biel explained. "Normally, [as an actor] you just come to set and don't have to worry about any of the problems. I don't have to worry about if the money is there. I don’t have to worry about if the cast is happy."

Biel acknowledges that splitting her time between acting, producing and being a mother is a challenge and requires her to "find that balance" between her passions. However, she's interested in "doing it all."

"I so enjoy finding these stories and creating something that I have more of my stamp on as opposed to just giving a performance and crossing my fingers and hoping for the best," Biel said. "To have a little of both worlds has been really cool for me and very fulfilling."

The Devil and the Deep Blue Sea is set to hit theaters later this year.